Can we run Compose `TextMeasurer` `measure` method on a background thread? I tried running it inside...

# compose

[mohamed rejeb]

Can we run Compose TextMeasurer measure method on a background thread? I tried running it inside a LaunchedEffect on Dispatchers.Default but it keeps blocking the main thread.

[mohamed rejeb]

I'm measuring the font size so the text fits all available space. And I'm hiding the text when I'm measuring and I show it after.

[Halil Ozercan]

@Composable
fun DrawTextMeasure() {
    val textMeasurer = rememberTextMeasurer()
    val textLayoutResult by produceState<TextLayoutResult?>(initialValue = null) {
        withContext(Dispatchers.Default) {
            println("TextMeasurer; running thread ${Thread.currentThread().id}")
            delay(5000)
            println("TextMeasurer; calculating thread ${Thread.currentThread().id}")
            value = textMeasurer.measure("Hello, World!")
        }
    }

    Canvas(Modifier.fillMaxWidth().height(100.dp)) {
        val padding = 16.dp.toPx()
        textLayoutResult?.let { drawText(it, topLeft = Offset(padding, padding)) }
    }
}

Something like this seems to work without blocking the main thread. produceState is just a fancy LaunchedEffect wrapper.